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Re: Looking at a used air compressor
You can't avoid some rust in the tank, air has moisture in it and it drops out in the compressor. Let it run a while, at least to full pressure. Then wait for it to cycle so that you know the pressure switch is working. Some pressure switches are adjustable and you want to watch that it doesn't go beyond the rating of the compressor. If it does it may have been set higher and overworked or may just be worn. It should cycle on and off at the same pressures each time. Also check voltage. Many don't realize that there is 208 and 220 volts at different areas and the difference can be enough to cause overheating problems.
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